1. Fixed partial denture as a whole, when seated on the abutments, can only follow a direction of insertion of this direction is the common place Road in the abutment. Therefore, the choice of abutments should be noted that the arrangement position and orientation of the teeth to determine the availability of a common place Road. Teeth with a mild tilt shift, may be appropriate to eliminate undercuts, or slightly change the place Road direction, you will have a common place to those who can also be selected as the abutments. But experiments show that in recent years, the abutments tilt less than 30 degrees, tilted abutment fixed partial denture, and they can still improve the stress state.
2. For tilt displacement of the tooth, if the patient is young, in the case of a conditional best to orthodontic treatment to correct teeth, and then selected as the abutments, or change the design of the retainer, prepare abutment when both to achieve a common place Road, not to damage the pulp, and the other end of the abutment teeth to dental supplies diversify he force, can still be selected as the abutments. For the serious dislocation of the tooth, has affected the abutment preparation, retainer may reveal too much metal, detrimental to the appearance by, you should not be selected as the abutments.
3. Missing teeth, such as missing teeth more or interval of missing teeth, the need to use multiple abutments should take the research model, the wire on the observation instrument design in place Road. Consider the common-place Road at the same time, we must pay attention to Porcelain teeth rework some of the problems minimize the incisor grinding tissue, but also consider the effect of the appearance of the row of teeth, adjusting the size of the missing gap.
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